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17 December, 13:27

One year ago, Nolan could run a mile in m minutes. Since then, his time has decreased by 9%. Write two different expressions that represent the number of minutes it now takes Nolan to run a mile, and show or explain why the expressions are equivalent.

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  1. 17 December, 13:41
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    I just wrote: 1m-9% (of the time) and 1m-0.09 (multiplied by the time). This makes sense because 9% and 0.09 are equal, just one of them is in decimal form.
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